Tianyi Cui
87a249106f
Master's #660 replaced dsh-subagent-subprocess with the dsh-subprocess capability seam (ctx.subprocess + scrubbedParentEnv, tree-scoped teardown) and moved subagent-acp onto it. Convergence for this branch's packages: - The shared out-of-process provider vocabulary this branch had grown in the deleted library (NO_START_CAPABILITIES, assertPositiveFinite, cwd resolution, settleRunResult, subprocessRunHandle) moves into the subagent seam package as out-of-process.ts — it enforces subagent-seam contracts, not process mechanics, and both out-of-process backends now import it from there (subagent-acp keeps master's shape otherwise). - subagent-sdk spawns THROUGH the SDK client (the subprocess README's documented exception for SDK-managed transports) and now applies the seam's scrubbedParentEnv() + explicit-env merge in place of the deleted buildChildEnv. - sdk-client inlines the EOF→SIGTERM→SIGKILL ladder as private helpers (it runs outside any harness context, so it cannot ride ctx.subprocess). - The child harness fixture gains the now-required dsh-subprocess-local entry for bash-local; the fixture cordis.yml keeps exercising the shipped provider default.
DeepSeek Harness
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DeepSeek Harness (dsh) is an open-source coding agent built on the DeepSeek Harness SDK.
It uses an architecture where everything is a plugin.
Install
Install dsh with one command:
curl -fsSL https://raw.githubusercontent.com/deepseek-harness/deepseek-harness/master/scripts/install.sh | sh
The installer requires git and Node ^22.19 || >=24, offers to install pnpm when it is missing, and prompts for a DeepSeek API key.
The installer clones DeepSeek Harness to ~/.dsh/source, links dsh into ~/.local/bin, and launches it. Re-running the command updates the checkout. See scripts/install.sh for alternate install locations and other options.
Use DeepSeek Harness
Web UI
For the recommended local interface, build the frontend after installation and after each update, then start the Web UI:
pnpm --dir ~/.dsh/source run build && pnpm --dir ~/.dsh/source run build:web
dsh web
The Web UI is served at http://127.0.0.1:3080 by default.
TUI
Start the full-screen terminal interface:
dsh
Headless
Run one task, print the final answer, and exit:
dsh -p "summarize this workspace"
Why DeepSeek Harness
Built-in capabilities cover file reading, editing, and search; shell execution; reusable skills; task tracking; subagents and workflows; persistent sessions; and context compaction. The TUI also includes Plan Mode.
- Everything is a plugin. Models, tools, policies, storage, context management, and interfaces are composable Cordis plugins, so deployments can extend or replace behavior without forking the agent loop. See the architecture for the underlying design.
- Code Mode (opt-in). It exposes a
run_codetool and a generated TypeScript SDK; only program output re-enters model context. See Code Mode. - Self-referential Cordis tools are opt-in. They let the agent inspect its live runtime and mount or unmount plugins while it runs. See the Cordis tools.
Community
Follow DeepSeek Harness on Twitter for project updates.
Development
pnpm install
pnpm run test:coverage
Start with the development guide and read the architecture before changing packages.
For agents, follow AGENTS.md.
DeepSeek Harness is currently pre-release.